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/* |
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* Copyright (C) 2003-2007 Anders Gavare. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. The name of the author may not be used to endorse or promote products |
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* derived from this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* |
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* $Id: symbol.c,v 1.1 2007/06/20 14:25:14 debug Exp $ |
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* |
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* Address to symbol translation routines. |
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* |
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* This module is (probably) independent from the rest of the emulator. |
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* symbol_init() must be called before any other function in this file is used. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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#include "symbol.h" |
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|
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|
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#define SYMBOLBUF_MAX 100 |
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|
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|
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/* |
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* symbol_nsymbols(): |
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* |
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* Return n_symbols. |
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*/ |
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int symbol_nsymbols(struct symbol_context *sc) |
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{ |
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return sc->n_symbols; |
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} |
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|
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|
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/* |
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* get_symbol_addr(): |
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* |
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* Find a symbol by name. If addr is non-NULL, *addr is set to the symbol's |
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* address. Return value is 1 if the symbol is found, 0 otherwise. |
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* |
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* NOTE: This is O(n). |
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*/ |
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int get_symbol_addr(struct symbol_context *sc, char *symbol, uint64_t *addr) |
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{ |
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struct symbol *s; |
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|
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if (sc->sorted_array) { |
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int i; |
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for (i=0; i<sc->n_symbols; i++) |
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if (strcmp(symbol, sc->first_symbol[i].name) == 0) { |
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if (addr != NULL) |
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*addr = sc->first_symbol[i].addr; |
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return 1; |
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} |
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} else { |
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s = sc->first_symbol; |
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while (s != NULL) { |
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if (strcmp(symbol, s->name) == 0) { |
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if (addr != NULL) |
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*addr = s->addr; |
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return 1; |
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} |
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s = s->next; |
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} |
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} |
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|
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return 0; |
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} |
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|
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|
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/* |
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* get_symbol_name_and_n_args(): |
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* |
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* Translate an address into a symbol name. The return value is a pointer |
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* to a static char array, containing the symbol name. (In other words, |
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* this function is not reentrant. This removes the need for memory allocation |
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* at the caller's side.) |
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* |
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* If offset is not a NULL pointer, *offset is set to the offset within |
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* the symbol. For example, if there is a symbol at address 0x1000 with |
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* length 0x100, and a caller wants to know the symbol name of address |
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* 0x1008, the symbol's name will be found in the static char array, and |
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* *offset will be set to 0x8. |
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* |
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* If n_argsp is non-NULL, *n_argsp is set to the symbol's n_args value. |
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* |
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* If no symbol was found, NULL is returned instead. |
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*/ |
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static char symbol_buf[SYMBOLBUF_MAX+1]; |
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char *get_symbol_name_and_n_args(struct symbol_context *sc, uint64_t addr, |
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uint64_t *offset, int *n_argsp) |
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{ |
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struct symbol *s; |
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|
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if (sc->n_symbols == 0) |
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return NULL; |
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|
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if ((addr >> 32) == 0 && (addr & 0x80000000ULL)) |
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addr |= 0xffffffff00000000ULL; |
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|
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symbol_buf[0] = symbol_buf[SYMBOLBUF_MAX] = '\0'; |
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if (offset != NULL) |
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*offset = 0; |
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|
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if (!sc->sorted_array) { |
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/* Slow, linear O(n) search: */ |
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s = sc->first_symbol; |
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while (s != NULL) { |
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/* Found a match? */ |
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if (addr >= s->addr && addr < s->addr + s->len) { |
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if (addr == s->addr) |
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snprintf(symbol_buf, SYMBOLBUF_MAX, |
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"%s", s->name); |
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else |
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snprintf(symbol_buf, SYMBOLBUF_MAX, |
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"%s+0x%"PRIx64, s->name, (uint64_t) |
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(addr - s->addr)); |
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if (offset != NULL) |
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*offset = addr - s->addr; |
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if (n_argsp != NULL) |
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*n_argsp = s->n_args; |
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return symbol_buf; |
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} |
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s = s->next; |
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} |
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} else { |
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/* Faster, O(log n) search: */ |
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int lowest = 0, highest = sc->n_symbols - 1; |
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while (lowest <= highest) { |
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int ofs = (lowest + highest) / 2; |
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s = sc->first_symbol + ofs; |
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|
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/* Found a match? */ |
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if (addr >= s->addr && addr < s->addr + s->len) { |
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if (addr == s->addr) |
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snprintf(symbol_buf, SYMBOLBUF_MAX, |
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"%s", s->name); |
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else |
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snprintf(symbol_buf, SYMBOLBUF_MAX, |
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"%s+0x%"PRIx64, s->name, (uint64_t) |
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(addr - s->addr)); |
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|
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if (offset != NULL) |
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*offset = addr - s->addr; |
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if (n_argsp != NULL) |
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*n_argsp = s->n_args; |
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|
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return symbol_buf; |
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} |
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|
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if (addr < s->addr) |
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highest = ofs - 1; |
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else |
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lowest = ofs + 1; |
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} |
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} |
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|
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/* Not found? Then return NULL. */ |
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return NULL; |
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} |
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|
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|
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/* |
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* get_symbol_name(): |
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* |
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* See get_symbol_name_and_n_args(). |
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*/ |
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char *get_symbol_name(struct symbol_context *sc, uint64_t addr, uint64_t *offs) |
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{ |
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return get_symbol_name_and_n_args(sc, addr, offs, NULL); |
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} |
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|
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|
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/* |
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* add_symbol_name(): |
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* |
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* Add a symbol to the symbol list. |
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*/ |
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void add_symbol_name(struct symbol_context *sc, |
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uint64_t addr, uint64_t len, char *name, int type, int n_args) |
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{ |
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struct symbol *s; |
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|
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if (sc->sorted_array) { |
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fprintf(stderr, "add_symbol_name(): Internal error: the " |
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"symbol array is already sorted\n"); |
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exit(1); |
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} |
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|
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if (name == NULL) { |
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fprintf(stderr, "add_symbol_name(): name = NULL\n"); |
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exit(1); |
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} |
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|
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if (addr == 0 && strcmp(name, "_DYNAMIC_LINK") == 0) |
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return; |
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|
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if (name[0] == '\0') |
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return; |
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|
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/* TODO: Maybe this should be optional? */ |
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if (name[0] == '.' || name[0] == '$') |
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return; |
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|
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/* Quick test-hack: */ |
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if (n_args < 0) { |
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if (strcmp(name, "strlen") == 0) |
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n_args = 1; |
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if (strcmp(name, "strcmp") == 0) |
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n_args = 2; |
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if (strcmp(name, "strcpy") == 0) |
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n_args = 2; |
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if (strcmp(name, "strncpy") == 0) |
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n_args = 3; |
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if (strcmp(name, "strlcpy") == 0) |
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n_args = 3; |
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if (strcmp(name, "strlcat") == 0) |
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n_args = 3; |
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if (strcmp(name, "strncmp") == 0) |
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n_args = 3; |
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if (strcmp(name, "memset") == 0) |
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n_args = 3; |
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if (strcmp(name, "memcpy") == 0) |
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n_args = 3; |
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if (strcmp(name, "bzero") == 0) |
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n_args = 2; |
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if (strcmp(name, "bcopy") == 0) |
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n_args = 3; |
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} |
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|
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if ((addr >> 32) == 0 && (addr & 0x80000000ULL)) |
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addr |= 0xffffffff00000000ULL; |
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|
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CHECK_ALLOCATION(s = malloc(sizeof(struct symbol))); |
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memset(s, 0, sizeof(struct symbol)); |
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|
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s->name = symbol_demangle_cplusplus(name); |
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|
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if (s->name == NULL) |
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CHECK_ALLOCATION(s->name = strdup(name)); |
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|
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s->addr = addr; |
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s->len = len; |
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s->type = type; |
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s->n_args = n_args; |
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|
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sc->n_symbols ++; |
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|
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/* Add first in list: */ |
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s->next = sc->first_symbol; |
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sc->first_symbol = s; |
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} |
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|
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|
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/* |
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* symbol_readfile(): |
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* |
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* Read 'nm -S' style symbols from a file. |
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* |
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* TODO: This function is an ugly hack, and should be replaced |
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* with something that reads symbols directly from the executable |
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* images. |
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*/ |
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void symbol_readfile(struct symbol_context *sc, char *fname) |
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{ |
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FILE *f; |
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char b1[80]; uint64_t addr; |
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char b2[80]; uint64_t len; |
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char b3[80]; int type; |
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char b4[80]; |
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int cur_n_symbols = sc->n_symbols; |
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|
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f = fopen(fname, "r"); |
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if (f == NULL) { |
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perror(fname); |
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exit(1); |
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} |
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|
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while (!feof(f)) { |
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memset(b1, 0, sizeof(b1)); |
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memset(b2, 0, sizeof(b2)); |
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memset(b3, 0, sizeof(b3)); |
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memset(b4, 0, sizeof(b4)); |
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fscanf(f, "%s %s\n", b1,b2); |
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if (strlen(b2) < 2 && !(b2[0]>='0' && b2[0]<='9')) { |
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strlcpy(b3, b2, sizeof(b3)); |
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strlcpy(b2, "0", sizeof(b2)); |
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fscanf(f, "%s\n", b4); |
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} else { |
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fscanf(f, "%s %s\n", b3,b4); |
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} |
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|
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/* printf("b1='%s' b2='%s' b3='%s' b4='%s'\n", |
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b1,b2,b3,b4); */ |
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addr = strtoull(b1, NULL, 16); |
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len = strtoull(b2, NULL, 16); |
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type = b3[0]; |
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/* printf("addr=%016"PRIx64" len=%016"PRIx64" type=%i\n", |
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addr, len, type); */ |
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|
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if (type == 't' || type == 'r' || type == 'g') |
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continue; |
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|
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add_symbol_name(sc, addr, len, b4, type, -1); |
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} |
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|
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fclose(f); |
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|
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debug("%i symbols\n", sc->n_symbols - cur_n_symbols); |
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} |
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|
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|
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/* |
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* sym_addr_compare(): |
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* |
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* Helper function for sorting symbols according to their address. |
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*/ |
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int sym_addr_compare(const void *a, const void *b) |
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{ |
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struct symbol *p1 = (struct symbol *) a; |
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struct symbol *p2 = (struct symbol *) b; |
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|
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if (p1->addr < p2->addr) |
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return -1; |
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if (p1->addr > p2->addr) |
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return 1; |
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|
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return 0; |
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} |
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|
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|
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/* |
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* symbol_recalc_sizes(): |
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* |
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* Recalculate sizes of symbols that have size = 0, by creating an array |
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* containing all symbols, qsort()-ing that array according to address, and |
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* recalculating the size fields if necessary. |
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*/ |
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void symbol_recalc_sizes(struct symbol_context *sc) |
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{ |
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struct symbol *tmp_array; |
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struct symbol *last_ptr; |
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struct symbol *tmp_ptr; |
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int i; |
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|
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CHECK_ALLOCATION(tmp_array = malloc(sizeof (struct symbol) * |
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sc->n_symbols)); |
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|
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/* Copy first_symbol --> tmp_array, and remove the old |
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first_symbol at the same time: */ |
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tmp_ptr = sc->first_symbol; |
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i = 0; |
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while (tmp_ptr != NULL) { |
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tmp_array[i] = *tmp_ptr; |
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last_ptr = tmp_ptr; |
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tmp_ptr = tmp_ptr->next; |
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free(last_ptr); |
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i++; |
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} |
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|
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qsort(tmp_array, sc->n_symbols, sizeof(struct symbol), |
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sym_addr_compare); |
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sc->sorted_array = 1; |
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|
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/* Recreate the first_symbol chain: */ |
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sc->first_symbol = NULL; |
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for (i=0; i<sc->n_symbols; i++) { |
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/* Recalculate size, if 0: */ |
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if (tmp_array[i].len == 0) { |
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uint64_t len; |
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if (i != sc->n_symbols-1) |
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len = tmp_array[i+1].addr |
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- tmp_array[i].addr; |
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else |
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len = 1; |
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|
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tmp_array[i].len = len; |
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} |
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|
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tmp_array[i].next = &tmp_array[i+1]; |
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} |
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|
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sc->first_symbol = tmp_array; |
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} |
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|
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|
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/* |
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* symbol_init(): |
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* |
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* Initialize the symbol hashtables. |
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*/ |
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void symbol_init(struct symbol_context *sc) |
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{ |
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sc->first_symbol = NULL; |
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sc->sorted_array = 0; |
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sc->n_symbols = 0; |
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} |
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